Bangor (băng'gôr) [key], town (1981 pop. 12,174), Gwynedd, NW Wales, at the northern end of Menai Strait. Slate is shipped from adjacent Port Penrhyn. The cathedral, on the site of a 6th-century church, dates from the 11th cent. and has been rebuilt several times. Bangor is the seat of a constitutent institution of the Univ. of Wales.